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Sujet WLAN 2025 PDF

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802.11b Channels

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a) Trame 802.11

4 address fields! (what’s a DS—distribution system?) * Address 1: always used for reception decision * Address 2: Address of transmitting station * Address 3: Final recipient (to DS); Original source (from DS); * Address 4: Source address if the frame is in transit between relays (optional)

DS = disributed System = système ethernet image image

  • DA = Destination Address
  • SA = Source Address
  • BSSID = Basic Service Set Identifier = Nom du wifi
  • RA = Receiver Address = L'adresse MAC de l'appareil qui reçoit la trame à un moment donné
  • TA = Transmitter Address = L'adresse MAC de l'appareil qui a transmis la trame